Modification of the sewage sludge ash P-mineralogy by thermo-chemical
treatment with LF slags
© Lehrstuhl fĂĽr Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben (11/2022)
As an essential nutrient Phosphorus (P) is an important constituent in fertilisers used in agriculture. However, almost the entire amount of P used in Europe must be imported from sources worldwide. High amounts of P are concentrated in sewage sludge from mostly municipal sewage. From 2029 P-recycling from sewage sludge is mandatory for wastewater treatment plants in Germany. In this study, a process which uses a thermo-chemical treatment of sewage sludge ash (SSA) with Ca-carriers, is developed. The method succeeds in producing materials which match the demands for plant available P and as proven by chemical extraction and pot trials as required by national and European regulations for fertilisers. This was achieved by treating the molten SSA with burnt lime and slags from Ca-rich ladle furnace (LF-slag) which results in the formation of better soluble P-minerals in comparison to the phases whitlockite and apatite mostly abundant in SSA.
© Lehrstuhl fĂĽr Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben (11/2022)
As an essential nutrient Phosphorus (P) is an important constituent in fertilisers used in agriculture. However, almost the entire amount of P used in Europe must be imported from sources worldwide. High amounts of P are concentrated in sewage sludge from mostly municipal sewage. From 2029 P-recycling from sewage sludge is mandatory for wastewater treatment plants in Germany. In this study, a process which uses a thermo-chemical treatment of sewage sludge ash (SSA) with Ca-carriers, is developed. The method succeeds in producing materials which match the demands for plant available P and as proven by chemical extraction and pot trials as required by national and European regulations for fertilisers. This was achieved by treating the molten SSA with burnt lime and slags from Ca-rich ladle furnace (LF-slag) which results in the formation of better soluble P-minerals in comparison to the phases whitlockite and apatite mostly abundant in SSA.
Improving the dry magnetic separation of BOF-slag by applying an
innovative pre-treatment process
© Lehrstuhl fĂĽr Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben (11/2022)
To approach circular economy by enhancing the internal recycling potential of BOFslag, an innovative pre-treatment process for the dry magnetic separation is investigated. It consists of slow-cooling to enlarge the slag crystals, followed by microwave irradiation to generate intergranular cracks to enhance the mineral liberation during comminution. It can be shown that the pre-treatment leads to an increase in the separation degree by at least four percent. This can be further enhanced by a factor of five by using solid-state oxidation.
© Lehrstuhl fĂĽr Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben (11/2022)
To approach circular economy by enhancing the internal recycling potential of BOFslag, an innovative pre-treatment process for the dry magnetic separation is investigated. It consists of slow-cooling to enlarge the slag crystals, followed by microwave irradiation to generate intergranular cracks to enhance the mineral liberation during comminution. It can be shown that the pre-treatment leads to an increase in the separation degree by at least four percent. This can be further enhanced by a factor of five by using solid-state oxidation.
Future Development of Waste Management in China According to the 13th Five-Year Plan
© ThomĂ©-Kozmiensky Verlag GmbH (9/2016)
Municipal solid waste (MSW) known as trash or garbage consists of food waste, paper, cardboard, plastics, PET, glass, textiles, metals, wood and leather, nappies, slug, ash, etc. are arising from human and animal activities. The rapid development and urbanization of China have resulted in an increasing volume of MSW. So the problem of MSW management has become a major social problem, but one the other hand, because of their intrinsic properties, MSW are often reusable and may be considered a resource for energy recovery. The delivering quantity of household waste averages 179 million tons in China, and the amount of untreated MSW over the years has reached 7 billion tons.
© ThomĂ©-Kozmiensky Verlag GmbH (9/2016)
Municipal solid waste (MSW) known as trash or garbage consists of food waste, paper, cardboard, plastics, PET, glass, textiles, metals, wood and leather, nappies, slug, ash, etc. are arising from human and animal activities. The rapid development and urbanization of China have resulted in an increasing volume of MSW. So the problem of MSW management has become a major social problem, but one the other hand, because of their intrinsic properties, MSW are often reusable and may be considered a resource for energy recovery. The delivering quantity of household waste averages 179 million tons in China, and the amount of untreated MSW over the years has reached 7 billion tons.
Sensor-based Sorting Systems for the Generation of a Landfill Fraction out of the Heavy Fraction of a MBT Plant
© Wasteconsult International (5/2011)
Practical Experience and Comparison of Processing Alternatives
© Wasteconsult International (5/2011)
Practical Experience and Comparison of Processing Alternatives
Sensor based sorting: A key technology for sustainable waste management
© Wasteconsult International (6/2010)
Waste is a heterogeneous mixture of materials often containing reusable or recyclable materials. In accordance with the hierarchy of the EU requirements “Prevention - Preparing for reuse – Recycling - Other Recovery – Disposal of Waste”, waste processing and recycling additionally fulfills the duty to protect the environment and to preserve primary resources. In order to meet the demands of increasing recycling rates and the quality of recycled waste materials sensor based sorting is playing an important and increasing role in waste processing techniques.
© Wasteconsult International (6/2010)
Waste is a heterogeneous mixture of materials often containing reusable or recyclable materials. In accordance with the hierarchy of the EU requirements “Prevention - Preparing for reuse – Recycling - Other Recovery – Disposal of Waste”, waste processing and recycling additionally fulfills the duty to protect the environment and to preserve primary resources. In order to meet the demands of increasing recycling rates and the quality of recycled waste materials sensor based sorting is playing an important and increasing role in waste processing techniques.
Solid waste material characterisation and recognition by hyperspectral imaging based logics
© Wasteconsult International (5/2007)
Waste materials characterization and recognition can be performed through their surface spectral response. Such a goal can be reached using specialized devices able to collect of hyperspectral images allowing to collect information about material surface properties, status and physical-chemical attributes.
© Wasteconsult International (5/2007)
Waste materials characterization and recognition can be performed through their surface spectral response. Such a goal can be reached using specialized devices able to collect of hyperspectral images allowing to collect information about material surface properties, status and physical-chemical attributes.
Influence of Plastic Deformation on Line Pipe Material
© Vulkan-Verlag GmbH (12/2004)
During pipe laying, line pipes may be subject to plastic deformation.
© Vulkan-Verlag GmbH (12/2004)
During pipe laying, line pipes may be subject to plastic deformation.
Progress in Geochemical Hazardous Waste Detection
© Lehrstuhl fĂĽr Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben (9/2004)
The "TSEEP" technology described in this article was designed to detect and map underground pollution cost effectively and rapidly.
© Lehrstuhl fĂĽr Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben (9/2004)
The "TSEEP" technology described in this article was designed to detect and map underground pollution cost effectively and rapidly.
Two-step biological treatment of coke oven wastewater
© Vulkan-Verlag GmbH (8/2004)
Due to high concentrations of pollutants, some of them inhibitory or toxic, coke oven effluents belong to the most delicate industrial wastewaters. Application of conventional biological treatment technology requires low-loaded, i. e. large volume bioreactors.
© Vulkan-Verlag GmbH (8/2004)
Due to high concentrations of pollutants, some of them inhibitory or toxic, coke oven effluents belong to the most delicate industrial wastewaters. Application of conventional biological treatment technology requires low-loaded, i. e. large volume bioreactors.
Remote monitoring of CCP – Experiences of operation and aspects to efficiency
© Vulkan-Verlag GmbH (7/2004)
In the late 1990’s a new generation of devices in the sector of remote monitoring of CCP appeared, which allowed the large-scaled application of CCP-remote monitoring.
© Vulkan-Verlag GmbH (7/2004)
In the late 1990’s a new generation of devices in the sector of remote monitoring of CCP appeared, which allowed the large-scaled application of CCP-remote monitoring.
